unfortunately in this digital age especially - I forsee that those who want to lash out in this mass murder way will continue to do so if we have twice as many guns or no guns at all.
Part of it is the notoriety and that comes with getting a large number - and if you can't do it will bullets - they will discover fire / carbon monixode, bleach and.. heck I'll bet there's a new fake ticktak challenge showing these things and more. how to recon to turn off AC and disable sprinklers and chain doors.. and the counts will be much higher.
I submit we need to focus on things like teaching conflict resolution, and have peer groups that can help the bullied and the slighted and things like that will likely have a better impact on changing these things.
(there's not enough counselors and they don't have enough reach when they are available)
I mean stressing the kids to learn geometry (and not conflict resolution) and just ignore the bullies is not working.
luckily locking doors and other methods can help with the bullets issue, that won't prevent mustard gas or a bus exhaust from penetrating and making someone famous.